Hives are raised, swollen, and itchy welts on the skin that can vary in size and shape. They often appear suddenly and may change in appearance within minutes to hours.

These can be caused by various factors, including allergic reactions to food, medications, insect stings, or environmental triggers. Non-allergic causes may include stress, infections, and autoimmune conditions.

Hives typically appear as raised, red or pink welts with defined borders. They can be round, oval, or irregular in shape and may merge to form larger areas of swelling.

Treatment may involve antihistamines to relieve itching and swelling. In severe cases or when hives are accompanied by other symptoms, oral corticosteroids or other medications may be prescribed.

How long do hives last?

Acute hives (short-term) may last for a few hours to several weeks and often resolve on their own. Chronic hives (lasting more than six weeks) can persist for months or even years.

Can hives be a sign of a severe allergic reaction?

Yes, hives can be a symptom of an allergic reaction, especially when accompanied by other symptoms such as difficulty breathing, swelling of the face or throat, or a drop in blood pressure. This can be a medical emergency requiring immediate attention.

Can stress trigger hives?

Yes, emotional stress can be a trigger for hives in some individuals. It's known as stress-induced or stress-related urticaria.

What is angioedema, and how is it related to hives?

Angioedema is a deeper swelling that occurs in the layers of the skin, often involving the face, lips, and eyes. It can occur alongside hives in some cases and may be a more severe manifestation of an allergic reaction.

How are hives diagnosed?

Diagnosis involves a thorough medical history, physical examination, and sometimes allergy testing. In many cases, the cause of hives may remain unknown.

Can certain foods trigger hives?

Yes, certain foods, such as nuts, shellfish, eggs, and dairy products, can trigger hives in individuals with food allergies. Identifying and avoiding specific triggers can help manage symptoms.

Are hives contagious?

No, hives are not contagious. They are a reaction of the immune system and do not spread from person to person.

Can hives be a chronic condition?

Yes, chronic hives can persist for an extended period, lasting more than six weeks. Identifying and managing triggers, along with the most targeted therapies that free you from daily antihistamines and steroids, can help.